Running Blender off of network drive
In my case, the following worked on my own shared drive, both PCs running Windows 7 Ultimate 64bit:

1. in the sharing settings for that particular folder, make sure that Read AND write are enabled:



2. Make sure your antivirus and firewall allow the exe to run (In my case, Avast was blocking it)

3. make sure that "Run as Administrator" is enabled in the exe properties: